Examine source code of purify Amazon URL

{
  "manifest_version": 2,
  "name": "purify Amazon URL",
  "version": "1.5",
  "description": "Purify bloated url of Amazon and reload tab.",
  "icons": {
    "48": "icons/48.png"
  },
  "permissions": [
    "tabs",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6aa476bd-cc28-4b82-8a96-1d3c3a309731}"
    }
  }
}